<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <title>Document</title>
    <script src="../react18/react.development.js"></script>
    <script src="../react18/react-dom.development.js"></script>
    <script src="../react18/babel.min.js"></script>
</head>
<body>
    <div id="app"></div>
    <script type="text/babel">
        // porps是用来做父子组件通信的
        // - 在父组件中使用子组件的时候,可以给子组件添加属性
        // - 在子组件中组件实例的props属性上,就能拿到这个属性和值
        class Parent extends React.Component{
            state={
                car:'法拉利'
            }
            render(){
                const {car}= this.state
                return (
                    <div>
                        <h1>我是基类</h1>
          
                        <p>我开的车{car}</p>
                        <button onClick={this.changeCarHandle}>股票涨停了,换一辆车</button>
                        <hr/>
                         <Child a={1} car={car}/>
                    </div>
                )
            
            }
            changeCarHandle = () =>{
                this.setState({car:'兰博基尼'})
              }
        }
        class Child extends React.Component{
            render(){
                const {car}= this.props;
                return (
                    <p>我继承车{car}</p>
                )
            }
        }
        
    const root = ReactDOM.createRoot(document.getElementById('app'));
    root.render(<Parent/>)
    </script>
</body>
</html>